described ; indeed, we cannot but regret how few of the 
many Cacrez# noticed by Travellers as inhabiting the 
Pacific side of extra-tropical America; have been yet intro- 
duced to our gardens. The early writers on Cactez erred 
in considering the Cacrez as almost peculiar to the warmer 
parts of the tropics, and curiosity was much excited when 
Dr. Gites sent from Mendoza (lat. 33° 25” S.) no less than 
twenty-two species. The distinguished Traveller and Nat- 
uralist, Mr. C. Darwin, found “ Cacti abundant, and of a 
large size, at Rio-Negro in latitude 41° S. :”” and one spe- 
cies, Opuntia Darwinii, HENstow, was seen by that gentle- 
man so far South as Port St. Julian in lat. 49° S., though 
more abundant in Patagonia, at Port Desire, lat. 47° S., 
where the climate indeed is remarkably dry and clear, hot 
m summer, but with sharp frosts during the winter nights. 
The present species I have no opportunity of describing 
particularly. It will be at once seen that in some charac- 
ters it approaches our M. atrata (t. 3642) differing, howe- 
ver, abundantly in its stouter habit, larger, and less closely 
placed, and more projecting mammille, the stouter and 
coarser aculei, larger flowers, and very unequal petals, 
which are moreover of a paler red colour, yellowish in their 
lower half. 
